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<base href="https://bugzilla.netfilter.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Netfilter does not check the sequence number strictly, a spoofed TCP RST packet with an in-window sequence number can cause the change of the mapping state"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1753">1753</a>
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<th>Summary</th>
<td>Netfilter does not check the sequence number strictly, a spoofed TCP RST packet with an in-window sequence number can cause the change of the mapping state
</td>
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<th>Product</th>
<td>netfilter/iptables
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>P5
</td>
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<th>Component</th>
<td>nf_conntrack
</td>
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<th>Assignee</th>
<td>netfilter-buglog@lists.netfilter.org
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<th>Reporter</th>
<td>yangyx22@mails.tsinghua.edu.cn
</td>
</tr></table>
<p>
<div>
<pre>We discover a fundamental vulnerability in Netfilter when it receives spoofed
TCP RST packets, which can be exploited by a malicious insider to conduct a TCP
hijacking attack to other clients under the same NAT device. The root cause
resides in the insufficient validation of TCP sequence numbers of TCP reset
packets received by Netfilter.</pre>
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</p>
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